Western wahoo (Euonymusoccidentalis)Distribution: Uncommon, west of the Cascades in southwestern Washington; British Columbia south to California.Habitat: Moist woods.Origin: NativeFlowers: May-June

Western wake-robin (Trilliumovatum)Distribution: Widely distributed in the forested areas of Washington; British Columbia south to California, east to Montana and Idaho; also in Colorado and Wyoming.Habitat: Open to dense moist forests at low to mid-elevations, often where boggy in the spring.Origin: NativeFlowers: March-June

Purple wakerobin (Trilliumpetiolatum)Distribution: East of the Cascades crest in Washington; Washington south to northeastern Oregon, east to Idaho.Habitat: Streambanks and moist meadows and thickets at low to moderate elevations.Origin: NativeFlowers: April-June

Aegean wallflower (Erysimumcheiri)Distribution: West of the Cascades in Washington; scattered locations in western and eastern North America.Habitat: Disturbed areas, often escaped from cultivation.Origin: IntroducedFlowers: April-June

Pale wallflower (Erysimumoccidentale)Distribution: East of the Cascades in Washington; Washington to Nevada, east to Idaho.Habitat: Sagebrush hills and valleys.Origin: NativeFlowers: March-May

Sand-dwelling wallflower (Erysimumarenicola)Distribution: In the Olympics, Cascades, and Blue mountains of Washington; British Columbia south to Oregon.Habitat: Open ridges and rock crevices, moderate to high elevations in the mountains.Origin: NativeFlowers: June-September

Small wallflower (Erysimuminconspicuum)Distribution: Known from the northeast region in Washington; Alaska south to Oregon and Nevada, east across much of the U.S. and Canada to the Atlantic Coast.Habitat: Rock outcroppings and roadsides where calcareous, also tolerant of alkaline soils.Origin: NativeFlowers: June-July

Spreading wallflower (Erysimumrepandum)Distribution: East of the Cascades in Washington; distributed throughout much of North America.Habitat: Wasteland in dry areas, plains and lower mountains.Origin: Introduced from EurasiaFlowers: April-June

Wallflower (Erysimumcheiri)Distribution: West of the Cascades in Washington; scattered locations in western and eastern North America.Habitat: Disturbed areas, often escaped from cultivation.Origin: IntroducedFlowers: April-June

Western wallflower (Erysimumoccidentale)Distribution: East of the Cascades in Washington; Washington to Nevada, east to Idaho.Habitat: Sagebrush hills and valleys.Origin: NativeFlowers: March-May

Wormseed wallflower (Erysimumcheiranthoides)Distribution: Occurring chiefly east of the Cascades crest in Washington; widely distributed throughout much of North America.Habitat: Disturbed areas including fields, roadsides and wastelots, often where moist.Origin: Introduced from EurasiaFlowers: June-August

Black walnut (Juglansnigra)Distribution: In scattered locations across Washington, mostly east of the Cascades; central U.S. east to the Atlantic Coast.Habitat: Disturbed areas and riparian zones, typically in the vicinity of urbanized areas where escaped from cultivation.Origin: IntroducedFlowers: April-May

Wapato (Sagittariacuneata)Distribution: East of the Cascades in Washington; British Columbia south to California, east to New York.Habitat: Ponds, lake shores and ditches.Origin: NativeFlowers: June-August

Wapato (Sagittarialatifolia)Distribution: Occurring on both sides of the Cascades in Washington; Vancouver Island, British Columbia south to central California; primary distribution in central and eastern North America.Habitat: Ditches, ponds, lakes, swampy areas.Origin: NativeFlowers: July-September

Wart-removing-herb (Murdanniakeisak)Distribution: Widely introduced in southeastern United States; occasional in Washington.Habitat: Ditches, swales and swamps, often in water.Origin: IntroducedFlowers: August - October

Lesser wartcress (Lepidiumdidymum)Distribution: Occurring west of the Cascades crest in Washington; British Columbia south to California and Arizona, and Texas eastward and northward to the Atlantic Coast.Habitat: Roadsides, gardens and wasteland.Origin: Introduced from South America (or possibly Eurasia)Flowers: May-July

Wartcress (Lepidiumdidymum)Distribution: Occurring west of the Cascades crest in Washington; British Columbia south to California and Arizona, and Texas eastward and northward to the Atlantic Coast.Habitat: Roadsides, gardens and wasteland.Origin: Introduced from South America (or possibly Eurasia)Flowers: May-July

Wartweed (Euphorbiahelioscopia)Distribution: Introduced chiefly west of the Cascades in Washington; widely distributed throughout much of North America.Habitat: Weed of cultivated areas and abondoned gardens.Origin: Introduced from EurasiaFlowers: April-July

Water (Equisetumfluviatile)Distribution: Alaska to Oregon, east across southern Canada and the northern tier of states in the United States.Habitat: Shallow water, marshes and bogs, along muddy shores, from the lowlands to moderate elevations in the mountains.Origin: Native

Pacific water-dropwort (Oenanthesarmentosa)Distribution: West of the Cascades from British Columbia south to California.Habitat: Low elevations; wet areas, often is standing water.Origin: NativeFlowers: June - August

Bulblet-bearing water-hemlock (Cicutabulbifera)Distribution: British Columbia to southern Oregon, east to Newfoundland and Virginia,Habitat: Marshes, bogs, wet meadows and standing water, lowlands to mountain valleys; uncommon in the Pacific Northwest.Origin: NativeFlowers: August - September

Bulbous water-hemlock (Cicutabulbifera)Distribution: British Columbia to southern Oregon, east to Newfoundland and Virginia,Habitat: Marshes, bogs, wet meadows and standing water, lowlands to mountain valleys; uncommon in the Pacific Northwest.Origin: NativeFlowers: August - September

Douglas' water-hemlock (Cicutadouglasii)Distribution: Widely distributed throughout Washington; British Columbia south to Oregon, east to Montana.Habitat: Marshes and wet areas, low to moderate elevations in the mountains.Origin: NativeFlowers: June-August

Spotted water-hemlock (Cicutamaculata)Distribution: Known from historic collections in the Spokane area; widely distributed throughout much of North America.Habitat: Marshes and wet areas.Origin: NativeFlowers: June-August

Western water-hemlock (Cicutadouglasii)Distribution: Widely distributed throughout Washington; British Columbia south to Oregon, east to Montana.Habitat: Marshes and wet areas, low to moderate elevations in the mountains.Origin: NativeFlowers: June-August

Cut-leaf water-horehound (Lycopusamericanus)Distribution: Both sides of the Cascades in Washington; throughout most of North America.Habitat: Nonalkaline wetland, riparian, pond and lakeshore sites at low to moderate elevations.Origin: NativeFlowers: June-August

Rough water-horehound (Lycopusasper)Distribution: Chiefly east of the Cascades; southern British Columbia to California, east to Colorado and Minnisota.Habitat: Marshes and shores of streams and lakes; tolerant of alkali.Origin: NativeFlowers: June-August

American water-lily (Nymphaeaodorata)Distribution: Widely distributed west of the Cascades in Washingtond, with scattered localities east of the Cascades; widely distributed througout central and eastern North America where native.Habitat: Lowland ponds and lakes both sides of the Cascades.Origin: IntroducedFlowers: June-October

Fragrant water-lily (Nymphaeaodorata)Distribution: Widely distributed west of the Cascades in Washingtond, with scattered localities east of the Cascades; widely distributed througout central and eastern North America where native.Habitat: Lowland ponds and lakes both sides of the Cascades.Origin: IntroducedFlowers: June-October

Cutleaf water-milfoil (Myriophyllumpinnatum)Distribution: Known in Washington only from Thurston County; southern British Columbia to Oregon, also in eastern North America.Habitat: Lakes, sloughs, ditches, slow streams.Origin: NativeFlowers: June-August

Various-leaved water-milfoil (Myriophyllumheterophyllum)Distribution: Known only from Puget Sound lowlands in Washington; British Columbia south to California; widely distributed east of the Mississippi River in Canada and the U.S where apparently it is native.Habitat: Lakes and ponds.Origin: IntroducedFlowers: May-October

Guadalupe water-nymph (Najasguadalupensis)Distribution: Oregon south to Baja California, east to the Atlantic Coast.Habitat: Fresh water.Origin: NativeFlowers: June - August

American water-parsley (Oenanthesarmentosa)Distribution: West of the Cascades from British Columbia south to California.Habitat: Low elevations; wet areas, often is standing water.Origin: NativeFlowers: June - August

Hemlock water-parsnip (Siumsuave)Distribution: Southern British Columbia to central California, east to Newfoundland and Virginia.Habitat: Swampy places and shallow water, in the valleys and foothills.Origin: NativeFlowers: July - August

Mild water-pepper (Persicariahydropiper)Distribution: Introduced weed found in much of North America and throughout the Pacific Northwest.Habitat: Swamps, ditches, and other wet places, mostly at low elevations.Origin: IntroducedFlowers: July - September

European water-plantain (Alismaplantago-aquatica)Distribution: Introduced occasionally, known from Seattle, Washington.Habitat: Marshy areas, sometimes largely submergedOrigin: Introduced from EurasiaFlowers: June - September

Fringed water-plantain (Damasoniumcalifornicum)Distribution: Known only from Klickitat County in Washington; Washington south to California, east to southwest Idaho and western Navada.Habitat: Sloughs, ditches and marshy fields.Origin: NativeFlowers: June-July

Grass-leaved water-plantain (Alismagramineum)Distribution: East of the Cascades in Washington; British Columbia south to California, east to Minnesota and WisconsinHabitat: Marshy areas, often in standing water.Origin: NativeFlowers: June-August

Narrow-leaf water-plantain (Alismagramineum)Distribution: East of the Cascades in Washington; British Columbia south to California, east to Minnesota and WisconsinHabitat: Marshy areas, often in standing water.Origin: NativeFlowers: June-August

Northern water-plantain (Alismatriviale)Distribution: Widely distributed throughout Washington; Alaska south to California, east across the northern half of North America to Newfoundland.Habitat: Streams, lakes, ponds, wet ditches, wetlands, and cattle ponds.Origin: NativeFlowers: June-September

Star water-plantain (Damasoniumcalifornicum)Distribution: Known only from Klickitat County in Washington; Washington south to California, east to southwest Idaho and western Navada.Habitat: Sloughs, ditches and marshy fields.Origin: NativeFlowers: June-July

Autumn water-starwort (Callitrichehermaphroditica)Distribution: Across northern North America, south to central California, northern New Mexico, the Great Lakes, and northeast United States.Habitat: Sloughs and streams.Origin: NativeFlowers: July - September

Different-leaved water-starwort (Callitricheheterophylla)Distribution: North and South America and Greenland.Habitat: Sloughs and slow-moving, fresh water.Origin: NativeFlowers: April - July

Northern water-starwort (Callitrichehermaphroditica)Distribution: Across northern North America, south to central California, northern New Mexico, the Great Lakes, and northeast United States.Habitat: Sloughs and streams.Origin: NativeFlowers: July - September

Pond water-starwort (Callitrichestagnalis)Distribution: Introduced in the Pacific Coast states, Montana, and some Eastern statesHabitat: Uncommon in streams, ponds and ditchesOrigin: Introduced from EuropeFlowers: May - August

Spring water-starwort (Callitrichepalustris)Distribution: General in North America except Mexico and south and southeast United States.Habitat: Sloughs and slow-moving fresh water.Origin: NativeFlowers: June - August

Vernal water-starwort (Callitrichepalustris)Distribution: General in North America except Mexico and south and southeast United States.Habitat: Sloughs and slow-moving fresh water.Origin: NativeFlowers: June - August

Pacific watercarpet (Chrysospleniumglechomifolium)Distribution: West of the Cascades and mostly along the coast, British Columbia south to northwest California.Habitat: Moist, usually swampy places, mostly at low elevations.Origin: NativeFlowers: Late March - May

Australian waterclover (Marsileamutica)Distribution: Known from Snohomish and Pacific counties in Washington; southeastern U.S.Habitat: Lowland ponds in water to 1 meter deep.Origin: Introduced

Watercress (Nasturtiumofficinale)Distribution: Distributed on both sides of the Cascades in Washington; widely distributed throughout North America.Habitat: Riparian zones and other wet areas.Origin: Introduced from EuropeFlowers: May-September

Rough-fruited waterhemp (Amaranthustuberculatus)Distribution: Cosmopolitan weed found throughout North America.Habitat: Moist or wet disturbed areas, particularly in association with agriculture or roadsides.Origin: Introduced from the Great Plains of the central United StatesFlowers: April-June

Tall waterhemp (Amaranthustuberculatus)Distribution: Cosmopolitan weed found throughout North America.Habitat: Moist or wet disturbed areas, particularly in association with agriculture or roadsides.Origin: Introduced from the Great Plains of the central United StatesFlowers: April-June

Ballhead waterleaf (Hydrophyllumcapitatum)Distribution: Mostly east of the Cascade summits in Washington; British Columbia south to California, east to Colorado.Habitat: Somewhat moist open slopes and woodlands, foothills to mid-elevations in the mountains.Origin: NativeFlowers: March-July

Fendler's waterleaf (Hydrophyllumfendleri)Distribution: Widely distributed throughout much of Washington; British Columbia south to California, east to Utah.Habitat: Thickets and moist open places, from lowlands to mid elevations in mountains.Origin: NativeFlowers: May-August

Pacific waterleaf (Hydrophyllumtenuipes)Distribution: West of the Cascades in Washington; Vancouver Island, British Columbia south to California.Habitat: Moist woods at lower elevations.Origin: NativeFlowers: May-July

Brazilian watermeal (Wolffiabrasiliensis)Distribution: Common in central and eastern United States, occasional in Washington to California, chiefly west of the CascadesHabitat: Ponds and standing water at low elevationsOrigin: Native

Watershield (Braseniaschreberi)Distribution: Occurring chiefly west of the Cascades in Washington; Alaska to California, east to much of Canada and eastern United States.Habitat: Shallow ponds and sluggish streams.Origin: NativeFlowers: July-September

Brazilian waterweed (Egeriadensa)Distribution: Introduced from Washington to California, and across the southern half of the United States to the Atlantic; occasional west of the Cascades in Washington and OregonHabitat: Commonly used in aquaria, often escapingOrigin: Introduced from South AmericaFlowers: July - September

Nuttall's waterweed (Elodeanuttallii)Distribution: Occasional in Washington, Oregon, Idaho and California; more common east to Maine and Virginia.Habitat: Fresh to slightly brackish water.Origin: NativeFlowers: July - September

Or common waterweed (Elodeacanadensis)Distribution: Throughout most of the United StatesHabitat: Common in slow-moving, often alkaline water, in the Pacific NorthwestOrigin: NativeFlowers: July - September

South American waterweed (Egeriadensa)Distribution: Introduced from Washington to California, and across the southern half of the United States to the Atlantic; occasional west of the Cascades in Washington and OregonHabitat: Commonly used in aquaria, often escapingOrigin: Introduced from South AmericaFlowers: July - September

Waterweed (Egeriadensa)Distribution: Introduced from Washington to California, and across the southern half of the United States to the Atlantic; occasional west of the Cascades in Washington and OregonHabitat: Commonly used in aquaria, often escapingOrigin: Introduced from South AmericaFlowers: July - September

Western waterweed (Elodeanuttallii)Distribution: Occasional in Washington, Oregon, Idaho and California; more common east to Maine and Virginia.Habitat: Fresh to slightly brackish water.Origin: NativeFlowers: July - September

Jimson weed (Daturawrightii)Distribution: Scattered locations across Washington; California east across the U.S. to New England.Habitat: Disturbed, dry, open areas, roadsides, and waste places.Origin: Introduced from MexicoFlowers: June-August

Klamath weed (Hypericumperforatum)Distribution: Widespread on both sides of the Cascades crest in Washington; widespread throughout much of North America.Habitat: Noxious weed of fields, meadows, roadsides, forest edge, wastelots, and other disturbed areas from the lowlands to near subalpine.Origin: Introduced from EuropeFlowers: June-July

Pahute weed (Suaedacalceoliformis)Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout North America from Alaska south to California, east to the Great Plains, and also along the coast of eastern North America.Habitat: Open, moist to wet areas, typically where saline.Origin: NativeFlowers: June-August

Poverty weed (Ivaaxillaris)Distribution: Chiefly east of the Castades, southern British Columbia to California, east to Manitoba and Oklahoma.Habitat: Dry, often alkaline places, in the valleys, plains and foothills.Origin: NativeFlowers: May - September

Pygmy weed (Crassulaconnata)Distribution: Known in Washington only from San Juan County; British Columbia south to California, east to Arizona and Texas.Habitat: Sandy areas, paths and roadsides.Origin: NativeFlowers: May-June

Water pygmy weed (Crassulaaquatica)Distribution: Occurring in scattered localities across Washington; Alaska south to California, east to the Rocky Mountains, and in the southeastern and northeastern regions of North America.Habitat: Mud flats and vernal pools.Origin: NativeFlowers: April-August

Woolly weed (Hieraciumscouleri)Distribution: Widely distributed throughout Washington; British Columbia south to California, chiefly in the Cascade-Sierra Nevada region.Habitat: Mostly dry places in open woods, foothills to moderate or sometimes higher elevations in the mountains.Origin: NativeFlowers: June-August

Weld (Resedaluteola)Distribution: Scattered locations in Washington; British Columbia south to California; scattered locations in central and eastern North America.Habitat: Disturbed ground.Origin: Introduced from EuropeFlowers: May-September

Bread wheat (Triticumaestivum)Distribution: Introduced world-wide, but fails to persist more that a few seasons on its own.Habitat: Cultivated in fields.Origin: IntroducedFlowers: April - June

Narrow-leaved cow wheat (Melampyrumlineare)Distribution: Occurring in the northeastern corner of Washington; British Columbia south to Washington, east across the northern half of North America to the Atlantic Coast.Habitat: Forest openings, rocky outcroppings, and wet areas from low to moderate elevations.Origin: NativeFlowers: July-August

?bluebunch wheatgrass (Pseudoroegneriaspicata)Distribution: British Columbia south, chiefly east of the Cascade crests, but also in the coastal mountains, to California, east to the Dakotas and New Mexico.Habitat: From the plains to mid-elevations in the mountains.Origin: NativeFlowers: June - August

Bluebunch wheatgrass (Pseudoroegneriaspicata)Distribution: British Columbia south, chiefly east of the Cascade crests, but also in the coastal mountains, to California, east to the Dakotas and New Mexico.Habitat: From the plains to mid-elevations in the mountains.Origin: NativeFlowers: June - August

Crested wheatgrass (Agropyroncristatum)Distribution: Introduced for forage purposes in many areas of western United States, becoming widely established.Habitat: Dry, open areas.Origin: IntroducedFlowers: June - August

Old man's whiskers (Geumtriflorum)Distribution: Occurring on both sides of the Cascades in Washington; widespread throughout the northern and western regions of North America.Habitat: Moister places in the sagebrush plains and foothills to subalpine ridges.Origin: NativeFlowers: April-August

Old-man's whiskers (Geumtriflorum)Distribution: Occurring on both sides of the Cascades in Washington; widespread throughout the northern and western regions of North America.Habitat: Moister places in the sagebrush plains and foothills to subalpine ridges.Origin: NativeFlowers: April-August

Asian white-top (Lepidiumchalepense)Distribution: Occurring east of the Cascades crest in Washington; widely distributed throughout much of North America.Habitat: Disturbed areas, especially where dry, often associated with agriculture.Origin: Introduced from AsiaFlowers: May-June

Whitetop (Lepidiumappelianum)Distribution: Widely distributed throughout many areas in Washington, though more common east of the Cascades crest; widely distributed throughout much of North America.Habitat: Disturbed soil, waste areas, in dry and moist places.Origin: Introduced from AsiaFlowers: April-August

Alkali false whitlow-grass (Cusickielladouglasii)Distribution: Occurring in the south-central area of Washington along the Oregon border; Washington south to California, east to Idaho, Nevada, and Utah.Habitat: Open, rocky ridges of the sagebrush desert, up into the lower mountains.Origin: NativeFlowers: April-June

Alpine whitlow-grass (Drabaaureola)Distribution: Currently only known only from the Mt. Rainier area in Washington; Washington south to northern CaliforniaHabitat: Alpine areas, including scree and moraine areas.Origin: NativeFlowers: July-August

Dense-leaf whitlow-grass (Drabadensifolia)Distribution: Occurring east of the Cascades crest in Washington; Alaska south to California, east to Alberta, Idaho, Wyoming, Nevada and Utah.Habitat: Open, rocky places from mid- to high elevations in the mountains.Origin: NativeFlowers: June-August

Douglas' whitlow-grass (Cusickielladouglasii)Distribution: Occurring in the south-central area of Washington along the Oregon border; Washington south to California, east to Idaho, Nevada, and Utah.Habitat: Open, rocky ridges of the sagebrush desert, up into the lower mountains.Origin: NativeFlowers: April-June

Few-seeded draba whitlow-grass (Drabaoligosperma)Distribution: In the North Cascades mountains in Washington; Alaska south to California, east to Colorado.Habitat: Plains to moderate elevations in the mountains.Origin: NativeFlowers: May-July

Great alpine whitlow-grass (Drabaaureola)Distribution: Currently only known only from the Mt. Rainier area in Washington; Washington south to northern CaliforniaHabitat: Alpine areas, including scree and moraine areas.Origin: NativeFlowers: July-August

Mt. Lassen draba whitlow-grass (Drabaaureola)Distribution: Currently only known only from the Mt. Rainier area in Washington; Washington south to northern CaliforniaHabitat: Alpine areas, including scree and moraine areas.Origin: NativeFlowers: July-August

Slender whitlow-grass (Drabaalbertina)Distribution: Occurring in the the Olympics and Cascades Mountains in Washington; Alaska south to California, east to the Rocky Mountains.Habitat: From subalpine meadows and forest openings to alpine meadows.Origin: NativeFlowers: May-August

Snowbed whitlow-grass (Drabacrassifolia)Distribution: Occurring in the Olympic Mountains and North Cascades in Washington; Alaska south to Washington, Nevada, east to the Rocky Mountains; east across northern Canada to Greenland; northern Europe.Habitat: Subalpine and alpine meadows, often in rock crevices and outcroppings.Origin: NativeFlowers: June-August

Whitlow-grass (Drabaaureola)Distribution: Currently only known only from the Mt. Rainier area in Washington; Washington south to northern CaliforniaHabitat: Alpine areas, including scree and moraine areas.Origin: NativeFlowers: July-August

Whitlow-grass (Drabaoligosperma)Distribution: In the North Cascades mountains in Washington; Alaska south to California, east to Colorado.Habitat: Plains to moderate elevations in the mountains.Origin: NativeFlowers: May-July

Woodland whitlow-grass (Drabanemorosa)Distribution: In scattered locations on both sides of the Cascades crest in Washington; Alaska south to California, east across the northern half of the U.S. and Canada to the Atlantic Coast.Habitat: Disturbed open areas and forest edges at low moderate elevations.Origin: NativeFlowers: March-June

Lancefruit draba whitlow-wort (Drabalonchocarpa)Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Northwest Territories, south in Rocky mountains to Colorado.Habitat: Alpine slopes, talus, and rocky outcroppings.Origin: NativeFlowers: June-August

Whitlow-wort (Drabaincerta)Distribution: Occurring in the Cascades and Olympic Mountains in Washington; British Columbia and Alberta south to Washington, east to Montana and Wyoming.Habitat: Alpine and subalpine slopes.Origin: NativeFlowers: June-August

Whitlow-wort (Drabalonchocarpa)Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Northwest Territories, south in Rocky mountains to Colorado.Habitat: Alpine slopes, talus, and rocky outcroppings.Origin: NativeFlowers: June-August

Yellowstone draba whitlow-wort (Drabaincerta)Distribution: Occurring in the Cascades and Olympic Mountains in Washington; British Columbia and Alberta south to Washington, east to Montana and Wyoming.Habitat: Alpine and subalpine slopes.Origin: NativeFlowers: June-August

Wild ginger (Asarumcaudatum)Distribution: Widely distributed throughout Washington except in central lowlands; British Columbia south to Oregon, east to Idaho and Montana.Habitat: Moist, shady woods at low to mid-elevations in the mountains.Origin: NativeFlowers: April-July

Blue wild-rye (Elymusglaucus)Distribution: Southern Alaska south to California, east to Ontario and Indiana.Habitat: Prairies, open woods, and dry to moist hillsides, from the lowlands to mid-elevations in the mountains.Origin: NativeFlowers: June - August

Sweet William (Dianthusbarbatus)Distribution: Introduced ornamental that occastionally escapes in western Washington and Oregon.Habitat: Wasteland and disturbed soil.Origin: Introduced from EuropeFlowers: June - August

Alpine willow (Salixpetrophila)Distribution: Northern Cascades of Washington; British Columbia south to California, east to the Rocky Mountains.Habitat: Alpine areas, often near melting snowbanks.Origin: NativeFlowers: July-Aug.

Arctic willow (Salixarctica)Distribution: Alaska, British Columbia to Labrador; northern Cascades in Washington, Wallowa Mountains in Oregon, and the Rockies in Idaho and MontanaHabitat: In wet to dry areas in the alpine.Origin: NativeFlowers: June-August

Arroyo willow (Salixlasiolepis)Distribution: Occurring east of the Cascades crest in Washington; Washington south to California, east to Idaho, south to the southern Rocky Mountains and Texas.Habitat: Riparian corridors from low to moderate elevations.Origin: NativeFlowers: April-June

Barclay's willow (Salixbarclayi)Distribution: Chiefly in the Olympic and Cascade mountains of Washington; Alaska east to Northwest Territories, south to Oregon and Wyoming.Habitat: Lakes, streams, and other riparian areas in subalpine and alpine zone.Origin: NativeFlowers: June-August

Bebb's willow (Salixbebbiana)Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America except for southcentral and southeastern U.S.Habitat: Lakes, streams, and other riparian areas from low to moderate elevations in the mountains.Origin: NativeFlowers: April-June

Bog willow (Salixpedicellaris)Distribution: Chiefly in the Cascades of Washington; Yukon Territory south to Oregon, east across Canada and northern U.S. to the Atlantic Coast.Habitat: Bogs, fens, and similar wet meadows.Origin: NativeFlowers: April-June

Booth's willow (Salixboothii)Distribution: In the Cascades of Washington; distributed in western North America from British Columbia east to Saskatchewan, south to California, east to Arizona.Habitat: Wet subalpine meadows, streambanks, lakeshores, and other riparian areas.Origin: NativeFlowers: May-July

Cascade willow (Salixcascadensis)Distribution: In the Cascade Mountains of Washington; British Columbia south in the Cascades to Mt. Rainier, occasionally east to northeast Oregon, Idaho and Montana, south to Utah and Colorado.Habitat: High elevations in the mountains in subalpine and alpine habitatsOrigin: NativeFlowers: June-August

Coastal willow (Salixhookeriana)Distribution: Chiefly west of the Cascades in Washington; British Columbia south to California.Habitat: Moist, often swamps areas, from the sea coast to mid-elevations in the mountains.Origin: NativeFlowers: March-April

Coyote willow (Salixexigua)Distribution: Chiefly east of the Cascades in Washington; British Columbia and Alberta south to California, east through the Rocky Mountains to Nebraska and Texas.Habitat: Riparian areas, gravel bars, lake and pond shore marginsOrigin: NativeFlowers: April-May

Drummond's willow (Salixdrummondiana)Distribution: In the East Cascades and mountains of eastern Washington; Yukon Territory east to Northwest Territories, south to California, east through the Rocky Mountains.Habitat: Streambanks, lakeshores, floodplains, and other riparian areas in montane and subalpine habitats.Origin: NativeFlowers: April-June

Dusky willow (Salixmelanopsis)Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia south to California, east to the northern and central Rocky Mountains.Habitat: Riparian zones including streambanks, pond and lake margins, and subalpine meadows.Origin: NativeFlowers: June-July

Dwarf snow willow (Salixnivalis)Distribution: In the Olympic and Cascade mountains of Washington; British Columbia and Alberta, south to California, east to Colorado.Habitat: Subalpine meadows and alpine areas.Origin: NativeFlowers: June-August

False mountain willow (Salixpseudomonticola)Distribution: Chiefly in the Cascade Mountains in Washington; Alaska to Washington, east to Quebec.Habitat: Wet meadows, forested wetlands, and other riparian areas in the mountains.Origin: NativeFlowers: April-June

Farr's willow (Salixfarriae)Distribution: Known only from Okanogan County in Washington; Yukon south to Oregon, east to Montana, Idaho and Wyoming.Habitat: Wet meadows and riparian zones from montane to subalpine.Origin: NativeFlowers: June-July

Geyer's willow (Salixgeyeriana)Distribution: Both sides of the Cascades in Washington; widespread in western North America from British Columbia south to California, east to the Rocky Mountains.Habitat: Lowland riparian areas including streambanks and pond and lake margins.Origin: NativeFlowers: April-June

Gray willow (Salixbebbiana)Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America except for southcentral and southeastern U.S.Habitat: Lakes, streams, and other riparian areas from low to moderate elevations in the mountains.Origin: NativeFlowers: April-June

Long-beak willow (Salixbebbiana)Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America except for southcentral and southeastern U.S.Habitat: Lakes, streams, and other riparian areas from low to moderate elevations in the mountains.Origin: NativeFlowers: April-June

Maccalla's willow (Salixmaccalliana)Distribution: East of the Cascades in Washington; Yukon Territory south to Washington, east across northern North America to Quebec.Habitat: Wet meadows, bogs, fens, streambanks and lakeshores from low to moderate elevations in the mountains.Origin: NativeFlowers: May-June

Mackenzie's willow (Salixprolixa)Distribution: Widely distributed throughout Washington; British Columbia to California, east to Newfoundland and Virginia.Habitat: Along streams in the lowlands to lower valleys in the mountains.Origin: NativeFlowers: April-June

Narrow-leaf willow (Salixexigua)Distribution: Chiefly east of the Cascades in Washington; British Columbia and Alberta south to California, east through the Rocky Mountains to Nebraska and Texas.Habitat: Riparian areas, gravel bars, lake and pond shore marginsOrigin: NativeFlowers: April-May

Pacific willow (Salixlasiandra)Distribution: Widely distributed throughout Washington; Alaska south to California, east to Manitoba and New Mexico.Habitat: Riparian areas from the coast to the mountains.Origin: NativeFlowers: March-June

Peach-leaf willow (Salixamygdaloides)Distribution: East side of the Cascades in Washington; widely distributed throughout North America except in extreme northwestern and southeastern regions.Habitat: Wetlands, streambanks, and other riparian areas.Origin: NativeFlowers: March-May

Plane-leaf willow (Salixplanifolia)Distribution: Chiefly in the Cascade Mountains of Washington; widely distributed throughout western North America and across northern half of North America to the Atlantic Coast.Habitat: Wet meadows, lake margins, streambanks and other riparian areas in the alpine and subalpine.Origin: NativeFlowers: May-July

Rock willow (Salixvestita)Distribution: North Cascade Mountains in Washington; British Columbia south to Oregon, east across northern North America to the Canadian Maritime Provinces.Habitat: Moist forest opening, streambanks, and other riparian areas in montane and subalpine habitats.Origin: NativeFlowers: June-July

Sage willow (Salixcandida)Distribution: In the mountains of northeastern and southeastern Washington; widespread across North America from Alaska south to Washington, east through central U.S. to Canadian Maritimes.Habitat: Lakeshores, pond margins, streambanks, and other riparian areas.Origin: NativeFlowers: April-June

Sage-leaf willow (Salixcandida)Distribution: In the mountains of northeastern and southeastern Washington; widespread across North America from Alaska south to Washington, east through central U.S. to Canadian Maritimes.Habitat: Lakeshores, pond margins, streambanks, and other riparian areas.Origin: NativeFlowers: April-June

Scouler's willow (Salixscouleriana)Distribution: Widely distributed throughout Washington; Alaska south to California, east to Manitoba and New Mexico.Habitat: Moist woods and streambanks, lowlands to moderate elevations in the mountains.Origin: NativeFlowers: March-June

Sessile-leaf willow (Salixsessilifolia)Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to Oregon.Habitat: Riparian corridors at low to moderate elevations.Origin: NativeFlowers: May-July

Short-fruited willow (Salixbrachycarpa)Distribution: Occurring east of the Cascades crest in Washington; Yukon Territory south to California, east to the Rocky Mountains; occurring across Canada.Habitat: Riparian areas at low to moderate elevations.Origin: NativeFlowers: April-June

Shortfruit willow (Salixbrachycarpa)Distribution: Occurring east of the Cascades crest in Washington; Yukon Territory south to California, east to the Rocky Mountains; occurring across Canada.Habitat: Riparian areas at low to moderate elevations.Origin: NativeFlowers: April-June

Sierran willow (Salixeastwoodiae)Distribution: In the mountains of Washington; Washington south to California, east to Montana, Wyoming, and Nevada.Habitat: Alpine and subalpine meadows.Origin: NativeFlowers: May-July

Sitka willow (Salixsitchensis)Distribution: Chiefly west of the east base of the Cascades in Washington; Alaska to California, east to Idaho.Habitat: Moist woods and streambanks, lowlands to moderate elevations in the mountains.Origin: NativeFlowers: April-June

Small-fruit willow (Salixbrachycarpa)Distribution: Occurring east of the Cascades crest in Washington; Yukon Territory south to California, east to the Rocky Mountains; occurring across Canada.Habitat: Riparian areas at low to moderate elevations.Origin: NativeFlowers: April-June

Tea-leaved willow (Salixplanifolia)Distribution: Chiefly in the Cascade Mountains of Washington; widely distributed throughout western North America and across northern half of North America to the Atlantic Coast.Habitat: Wet meadows, lake margins, streambanks and other riparian areas in the alpine and subalpine.Origin: NativeFlowers: May-July

Tweedy's willow (Salixtweedyi)Distribution: Chiefly North Cascade Mountains in Washington; British Columbia south to Washington, east to Montana, Idaho and Wyoming.Habitat: Wet meadows, lake margins, streambanks, and other riparian areas in alpine and subalpine.Origin: NativeFlowers: July-August

Under-green willow (Salixcommutata)Distribution: Chiefly in the Olympic and Cascade mountains of Washington; Alaska and Yukon south to Oregon, occasionally east to idaho and Montana.Habitat: Moist areas, mid- to high elevations in the mountains.Origin: NativeFlowers: June-September

Variable willow (Salixcommutata)Distribution: Chiefly in the Olympic and Cascade mountains of Washington; Alaska and Yukon south to Oregon, occasionally east to idaho and Montana.Habitat: Moist areas, mid- to high elevations in the mountains.Origin: NativeFlowers: June-September

Willow weed (Persicarialapathifolia)Distribution: Widely distributed throughout Washington; widely distributed throughout all of North America.Habitat: Streambanks, pond and lakeshores and other wet places.Origin: NativeFlowers: May-September

Hornemann's willow-herb (Epilobiumhornemannii)Distribution: Widely distributed throughout Washington; Alaska south to California, east to South Dakota and New Mexico.Habitat: Wet rocky areas and streambanks, low to subalpine elevations.Origin: NativeFlowers: June-September

Red willow-herb (Chamaenerionlatifolium)Distribution: Occurring in most mountainous areas of Washington except the southeast corner; Alaska south to the Sierra Nevada of California, east to Montana and Colorado.Habitat: River bars, along streams, and drier subalpine to alpine slopes.Origin: NativeFlowers: June-September

Alpine willowherb (Epilobiumanagallidifolium)Distribution: Both sides of the Cascades in Washington; Alaska to Greenland, throughout western and northeastern North America.Habitat: Alpine meadows, streambanks, and riparian areas.Origin: NativeFlowers: June-September

Autumn willowherb (Epilobiumbrachycarpum)Distribution: Throughout Washington; British Columbia south to California, east to Wisconsin in the north and New Mexico in the south.Habitat: Common in dry, open meadows and grasslands to lightly wooded areas.Origin: NativeFlowers: July-August

Brook willowherb (Epilobiumtorreyi)Distribution: East of the Cascades in Washington from Kittitas County south; both sides of the Cascades in Oregon, south to central California, east to Idaho and Nevada.Habitat: Places that are soggy with standing water in winter and spring, drying in summer.Origin: NativeFlowers: June-July

California willowherb (Epilobiumminutum)Distribution: Both sides of the Cascades crest in Washington; common from British Columbia south to California, east to Montana.Habitat: Dry or gravelly soil, sea level to mid-elevations in the mountains.Origin: NativeFlowers: April-August

Chaparral willowherb (Epilobiumminutum)Distribution: Both sides of the Cascades crest in Washington; common from British Columbia south to California, east to Montana.Habitat: Dry or gravelly soil, sea level to mid-elevations in the mountains.Origin: NativeFlowers: April-August

Ciliate willowherb (Epilobiumciliatum)Distribution: Widely distributed throughout all of Washington; widespread throughout much of North America.Habitat: Moist soil from lowlands to moderate elevations in the mountains.Origin: NativeFlowers: June-August

Ciliate willowherb (Epilobiumglandulosum)Distribution: Both sides of the Cascades in Washington; Alaska south to California, east to the Rocky Mts.; eastern North America.Habitat: Moist meadows and riparian areas from coastal elevations to subalpine.Origin: NativeFlowers: June-August

Dense-flower willowherb (Epilobiumdensiflorum)Distribution: Both sides of the Cascades in Washington; Vancouver Island, British Columbia south to Baja California, east to Montana and Nevada.Habitat: Boggy areas with standing water in winter and spring; occasional streamside.Origin: NativeFlowers: July-September

Glandular willowherb (Epilobiumhallianum)Distribution: Occurring in the mountains throughout Washington; occurring throughout western North America.Habitat: Moist to wet areas from montane to alpine habitats.Origin: NativeFlowers: June-August

Hall's willowherb (Epilobiumhallianum)Distribution: Occurring in the mountains throughout Washington; occurring throughout western North America.Habitat: Moist to wet areas from montane to alpine habitats.Origin: NativeFlowers: June-August

Marsh willowherb (Epilobiumpalustre)Distribution: Both sides of the Cascades in Washington; Alaska east to the Atlantic coast; south in the Rocky Mountains to Colorado.Habitat: Wet soil, often in bogs.Origin: NativeFlowers: June-August

Oregon willowherb (Epilobiumoregonense)Distribution: Both sides of the Cascades in Washington; British Columbia south to Arizona, east to Montana and Colorado.Habitat: Streambanks, bogs, and wet meadows from moderate elevations in mountains to alpine.Origin: NativeFlowers: June-September

Pimpernel willowherb (Epilobiumanagallidifolium)Distribution: Both sides of the Cascades in Washington; Alaska to Greenland, throughout western and northeastern North America.Habitat: Alpine meadows, streambanks, and riparian areas.Origin: NativeFlowers: June-September

Small-flowered willowherb (Epilobiumminutum)Distribution: Both sides of the Cascades crest in Washington; common from British Columbia south to California, east to Montana.Habitat: Dry or gravelly soil, sea level to mid-elevations in the mountains.Origin: NativeFlowers: April-August

Smooth willowherb (Epilobiumcampestre)Distribution: Central and eastern portion of Washington; British Columbia east to Saskatchewan, south to Arizona and California.Habitat: Mud flats, vernal pools.Origin: NativeFlowers: June-July

Smooth willowherb (Epilobiumglaberrimum)Distribution: Widely distributed throughtout much of the mountainous areas of Washington; British Ciolumbia south to California, east to Montana, Idaho and Colorado.Habitat: Wet places at mid-elevations in the mountains.Origin: NativeFlowers: June-August

Tall annual willowherb (Epilobiumbrachycarpum)Distribution: Throughout Washington; British Columbia south to California, east to Wisconsin in the north and New Mexico in the south.Habitat: Common in dry, open meadows and grasslands to lightly wooded areas.Origin: NativeFlowers: July-August

Talus willowherb (Epilobiumclavatum)Distribution: Both sides of the Cascades in Washington; Alaska to California, east to Montana and Colorado.Habitat: Moist meadows and talus slopes in the mountains, subalpine.Origin: NativeFlowers: June-September

Watson's willowherb (Epilobiumciliatum)Distribution: Widely distributed throughout all of Washington; widespread throughout much of North America.Habitat: Moist soil from lowlands to moderate elevations in the mountains.Origin: NativeFlowers: June-August

White-flower willowherb (Epilobiumlactiflorum)Distribution: Widely distributed on both sides of the Cascades in Washington; Alaska south to California, east to Montana, Colorado and New Mexico.Habitat: Wet meadows and seeps, mid- to high elevations in the mountains.Origin: NativeFlowers: June-September

Yellow willowherb (Epilobiumluteum)Distribution: In the Olympics and Cascades in Washington; Alaska south to California.Habitat: Stream banks and wet areas at mid- to high elevations in the mountains.Origin: NativeFlowers: July-September

Columbian windflower (Anemonedeltoidea)Distribution: On both sides of the Cascades in the southern half of Washington; Washington south to California.Habitat: Moist to drier areas in open to deep woods at low to moderate elevations.Origin: NativeFlowers: April-May

Piper's windflower (Anemonepiperi)Distribution: East of the Cascades in Washington;Washington to northeast Oregon east to Idaho and western Montana.Habitat: Shady woods at moderate to mid-elevations in the mountains.Origin: NativeFlowers: April-August

Windmill-pink (Silenegallica)Distribution: Occurring in the lowlands west of the Cascades crest in Washington; British Columbia south to California, east to Idaho and Arizona; also in the eastern half of the U.S.Habitat: Weed of disturbed soil and wasteland.Origin: Introduced from EuropeFlowers: May-July

Wingscale (Atriplexcanescens)Distribution: Occurring east of the Cascades crest in Washington; Washington south to California, east to the Great Plains.Habitat: Saline areas in the prairies.Origin: NativeFlowers: June-August

Bitter wintercress (Barbareavulgaris)Distribution: Chiefly west of the Cascades in Washington, with scattered locations east of the Cascades; distributed throughout much of the United States.Habitat: Garden escape, found chiefly in wet places.Origin: Introduced from EurasiaFlowers: April-July

Early wintercress (Barbareaverna)Origin: Introduced from EurasiaFlowers: April - July

Winterfat (Krascheninnikovialanata)Distribution: Occurring east of the Cascades in Washington; Washington south on the east side of the Cascades and Sierra Nevada to California, east to Idaho and Texas.Habitat: Plains and foothills, often in saline or alkaline soil.Origin: NativeFlowers: May-July

Alpine wintergreen (Gaultheriahumifusa)Distribution: In the Olympics and Cascades mountains of Washington; British Columbia south to northern California, east to the Rocky Mountains from Alberta to Colorado.Habitat: Subalpine to alpine, usually where moist to wet.Origin: NativeFlowers: July-August

Common pink wintergreen (Pyrolaasarifolia)Distribution: Widely distributed throughout much of forested Washington except for the southeast corner; Alaska south to California, east to Colorado in the west, and across the northern half of the United States to the Atlantic.Habitat: Moist ground in woodlands and forests, lowlands to mid-elevations.Origin: NativeFlowers: June-September

Green-flower wintergreen (Pyrolachlorantha)Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska south to California, east to the Rocky Mountains and across northern U.S. and Canada to the Atlantic Coast.Habitat: Chiefly in coniferous forests at moderate to mid-elevations, usually where moist.Origin: NativeFlowers: June-August

Lesser wintergreen (Pyrolaminor)Distribution: Occurring on both sides of the Cascades in Washington; Alaska south to California, east to the Rocky Mountains; east across Canada and northern U.S. to the Atlantic Coast.Habitat: Uncommon, mostly in moist areas in coniferous woods, moderate to high elevations in the mountains.Origin: NativeFlowers: June-August

Liver-leaf wintergreen (Pyrolaasarifolia)Distribution: Widely distributed throughout much of forested Washington except for the southeast corner; Alaska south to California, east to Colorado in the west, and across the northern half of the United States to the Atlantic.Habitat: Moist ground in woodlands and forests, lowlands to mid-elevations.Origin: NativeFlowers: June-September

Slender wintergreen (Gaultheriaovatifolia)Distribution: Chiefly in the Olympics and Cascades mountains in Washington, but also in the northeastern part of the State; British Columbia south to California, east to Idaho and Montana.Habitat: Forested areas from fairly dry Ponderosa pine to subalpine bogs.Origin: NativeFlowers: June-August

Snowline wintergreen (Pyrolaminor)Distribution: Occurring on both sides of the Cascades in Washington; Alaska south to California, east to the Rocky Mountains; east across Canada and northern U.S. to the Atlantic Coast.Habitat: Uncommon, mostly in moist areas in coniferous woods, moderate to high elevations in the mountains.Origin: NativeFlowers: June-August

White-vein wintergreen (Pyrolapicta)Distribution: Both sides of the Cascades, British Columbia to California, east to South Dakota and New MexicoHabitat: Coniferous woods, especially ponderosa pine, moderate to mid-elevations in the mountainsOrigin: NativeFlowers: June - August

Wiregrass (Carexlasiocarpa)Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska south to California, east to Idaho and Montana in our area; also throughout northeastern North America.Habitat: Wet meadows, bogs, fens, streambanks, and lakeshores where sometimes forming floating mats.Origin: NativeFlowers: May-September

Stiff branched wirelettuce (Stephanomeriapaniculata)Distribution: Occurring east of the Cascades in Washington; Oregon and adjacent Idaho, south to California.Habitat: Dry, open places in the plains and foothills.Origin: NativeFlowers: July-September

False wireweed (Rigiopappusleptocladus)Distribution: Pacific Northwest to Utah and California; chiefly east of the Columbia River in WashingtonHabitat: Dry, open areas at low elevations; sagebrush and grasslands areasOrigin: NativeFlowers: April - June

Witchgrass (Panicumcapillare)Distribution: Introduced and weedy in much of the United States and southern Canada.Habitat: Moist and irrigated areas, along streams and around ponds.Origin: NativeFlowers: June - September

Dyer's woad (Isatistinctoria)Distribution: Known only from scattered locations in central Washington; British Columbia south to California, east to the Rocky Mountains; also occurring in parts of central and eastern North America.Habitat: Disturbed dry ground, pastures, and roadsides, where often escaped from cultivation.Origin: Introduced from EurasiaFlowers: April-June

Woad (Isatistinctoria)Distribution: Known only from scattered locations in central Washington; British Columbia south to California, east to the Rocky Mountains; also occurring in parts of central and eastern North America.Habitat: Disturbed dry ground, pastures, and roadsides, where often escaped from cultivation.Origin: Introduced from EurasiaFlowers: April-June

Wolfberry (Elaeagnuscommutata)Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Quebec, south into Idaho, Montana and Utah.Habitat: Gravel benches and scabland, commonly along watercourses.Origin: NativeFlowers: June-July

Wolfberry (Symphoricarposoccidentalis)Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to Utah, east to the Atlantic Coast.Habitat: Prairies, forest margins, and bottomlands from low to mid-elevations.Origin: NativeFlowers: June-August

Eastern showy wood-aster (Eurybiaconspicua)Distribution: Northeast Oregon and eastern Washington, east to Wyoming and north to SaskatchewanHabitat: Open woods, foothills to mid-elevations in the mountainsOrigin: NativeFlowers: July - September

Siberian wood-aster (Eurybiasibirica)Distribution: Circumboreal; found in northern Rocky mountains, Pacific Northwest, and northward through Alberta, British Columbia, Yukon and Northwest Territories, and Alaska.Habitat: In Washington, this species is found in alpine and subalpine meadows.Origin: NativeFlowers: July - August

Slender wood-reed (Cinnalatifolia)Distribution: Alaska to Newfoundland, south on both sides of the Cascades, Washington to California, east to Colorado; also Minnesota to Maine, south to TennesseeHabitat: Moist woods and meadows, sea level to subalpineOrigin: NativeFlowers: June - August

Great wood-sorrel (Oxalistrilliifolia)Distribution: West slope of the Cascades in Washington; Washington south to northwest California.Habitat: Meadows and moist woods in the coastal mountains and up to 6000 feet in the Cascades.Origin: NativeFlowers: May-August

Oregon wood-sorrel (Oxalisoregana)Distribution: Olympic Mountains and west slope of the Cascades in Washington; British Columbia south to California.Habitat: Moist woods, low to moderate elevations.Origin: NativeFlowers: April-September

Slender yellow wood-sorrel (Oxalisdillenii)Distribution: Occurring on both sides of the Cascades crest in Washington; Washington south to Oregon, east across North America to the Atlantic Coast.Habitat: Open areas, often where moist, at low elevations.Origin: IntroducedFlowers: February-October

Trillium-leaf wood-sorrel (Oxalistrilliifolia)Distribution: West slope of the Cascades in Washington; Washington south to northwest California.Habitat: Meadows and moist woods in the coastal mountains and up to 6000 feet in the Cascades.Origin: NativeFlowers: May-August

Upright yellow wood-sorrel (Oxalisstricta)Distribution: Distributed on both sides of the Cascades in Washington, more common west of the Cascades; widely distributed throughout North America.Habitat: Disturbed ground, lawns and gardens.Origin: IntroducedFlowers: April-September

Western yellow wood-sorrel (Oxalissuksdorfii)Distribution: West of the Casccades in Washington; southern Washington to northwest California.Habitat: Low elevations, usually in moist, coastal woods but sometimes on rather dry, open slopes.Origin: NativeFlowers: April-August

Woodland-beardtongue (Nothochelonenemorosa)Distribution: Both sides of the Cascades, British Columbia to CaliforniaHabitat: Fairly dense woods to moist, open slopes at mid-elevations in the mountainsOrigin: NativeFlowers: July - August

Bulbous woodlandstar (Lithophragmaglabrum)Distribution: East of the Cascades in Washington; British Columbia to California, east to the Dakotas and Colorado.Habitat: Grasslands and sagebrush desert to ponderosa pine and Douglas fir forests.Origin: NativeFlowers: March-May

Slender woodlandstar (Lithophragmatenellum)Distribution: East side of the Cascades in Washington; British Columbia south to California, east to the Rocky Mountain states.Habitat: Sagebrush desert and ponderosa pine forests.Origin: NativeFlowers: May-June

Common woodrush (Luzulamultiflora)Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska south to Oregon, east to Alberta and western Montana; also in northeastern United States.Habitat: Fields, meadows, open woods and clearings, at low to moderate elevations in the mountains.Origin: NativeFlowers: May-July

Curved woodrush (Luzulaarcuata)Distribution: Alaska, British Columbia, and Mt. Rainier, Washington.Habitat: Rocky or gravelly soil, usually on moraines or above timberline.Origin: NativeFlowers: July - August

Hitchcock's woodrush (Luzulahitchcockii)Distribution: Occurring on both sides of the Cascades crest in Washington; southern British Columbia south to Crater Lake and the Wallowa Mountains of Oregon, east to Alberta, Idaho and Montana.Habitat: Montane forests to alpine slopes, ridges and meadows.Origin: NativeFlowers: July-September

Small flowered woodrush (Luzulaparviflora)Distribution: Alaska to Newfoundland, south to southern California and New York.Habitat: Moist to fairly dry areas, coastal rain forest to alpine slopes.Origin: NativeFlowers: May - August

Smooth woodrush (Luzulahitchcockii)Distribution: Occurring on both sides of the Cascades crest in Washington; southern British Columbia south to Crater Lake and the Wallowa Mountains of Oregon, east to Alberta, Idaho and Montana.Habitat: Montane forests to alpine slopes, ridges and meadows.Origin: NativeFlowers: July-September

Oregon woodsia (Woodsiaoregana)Distribution: Alaska to California, chiefly east of the Cascade summits in Washington and OregonHabitat: Rock crevices, ledges and talus slopes in the mountains, and in less arid parts of the lowlands.Origin: Native

Woodsia (Woodsiascopulina)Distribution: Alaska to California, chiefly east of the Cascade summits in Washington and OregonHabitat: Rock crevices, ledges and talus slopes in the mountains, and in less arid parts of the lowlands.Origin: Native

Common woolly sunflower (Eriophyllumlanatum)Distribution: Widely distributed throughout Washington; British Columbia to California, east Montana, Wyoming, and Utah.Habitat: Dry, open, often rocky areas at low to mid-elevations.Origin: NativeFlowers: May-August

Dwarf woolly-marbles (Psilocarphusbrevissimus)Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to California, east to the Rocky Mountains.Habitat: Dried beds of vernal pools.Origin: NativeFlowers: May-July

Oregon woollyheads (Psilocarphusoregonus)Distribution: Occurring east of the Cascades in Washington; Washington south to California, east to Idaho and Nevada.Habitat: Dried beds of vernal pools.Origin: NativeFlowers: May-July

Slender woollyheads (Psilocarphustenellus)Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California, east to Idaho.Habitat: Dry or seasonally moist barren or wooded slopes or flats, often on disturbed sites.Origin: NativeFlowers: March-August

Tall woollyheads (Psilocarphuselatior)Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California, east to Idaho and Montana.Habitat: Dried beds of vernal pools and other open, moist places.Origin: NativeFlowers: May-August

Wormseed (Dysphaniaambrosioides)Distribution: Occurring in scattered locations in Washington; native to southeastern U.S., but introduced in scattered localities in central and western U.S.Habitat: Roadsides and waste areas, riparian zones, tolerant of alkaline.Origin: Introduced from southern North America and tropical AmericaFlowers: July-November

Annual wormwood (Artemisiaannua)Distribution: Native of Eurasia, naturalized in eastern United States, rare in the Pacific Northwest.Habitat: Fields and waste places.Origin: IntroducedFlowers: August - October

Beach wormwood (Artemisiastelleriana)Distribution: Known from a few locations along the north coast in Washington; known only from Washington in western North America; central Canada and U.S. to the Atlantic Coast.Habitat: Coastal dunes and beaches.Origin: IntroducedFlowers: May-September

Biennial wormwood (Artemisiabiennis)Distribution: Native in the Pacific Northwest, but widely distributed elsewhere as a weed.Habitat: Waste places and streambanks, especially in sandy soil.Origin: Native? Disputed native (BC) or introduced (Chambers and Sundberg 2000)Flowers: August - October

Boreal wormwood (Artemisianorvegica)Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska south to California, east to the Rocky Mountains.Habitat: Subalpine and alpine areas, typically where moist.Origin: NativeFlowers: July-September

Cascade wormwood (Artemisiatilesii)Distribution: Occurring in the Olympic and Cascade Mountains of Washington; Alaska to Oregon, east to Montana and across Canada.Habitat: Open rocky or gravelly, wet or dry sites, mostly at high elevations in the mountains, descending to sea level northward.Origin: NativeFlowers: July-September

Coastal wormwood (Artemisiasuksdorfii)Distribution: Occurring west of the Cascades crest in Washington, British Columbia south to California.Habitat: Bluffs and rocky or sandy beaches, less commonly in other low, open places.Origin: NativeFlowers: June-August

Douglas wormwood (Artemisiadouglasiana)Distribution: Occurring in Washington chiefly east of the Cascades crest, but also on the west side; widely distributed throughout much of North America.Habitat: Mostly along stream banks and river bottoms.Origin: NativeFlowers: August-September

Dragon wormwood (Artemisiadracunculus)Distribution: Occurring east of the Cascades crest in Washington; widely distributed throughout the central and western portions of North America.Habitat: Shrub-steppe to dry, open areas at mid-elevations.Origin: NativeFlowers: July-October

Forked wormwood (Artemisiafurcata)Distribution: Occurring in the Cascades and Olympic Mountains of Washington; Alaska south to Washington, east to Northwest Territories, Alberta, and Nunavut.Habitat: Open, rocky ledges and talus slopes at high elevations in the mountains.Origin: NativeFlowers: July-September

Lobed wormwood (Artemisiavulgaris)Distribution: Introduced from Europe, now established in most of eastern United States and adjacent Canada; uncommon in the Pacific Northwest.Habitat: Waste areas and disturbed soil.Origin: IntroducedFlowers: August - October

Michaux's wormwood (Artemisiamichauxiana)Distribution: British Columbia to California, east to Alberta and Wyoming.Habitat: Rocky places in the mountains at rather high elevations.Origin: NativeFlowers: May - August

Northern wormwood (Artemisiacampestris)Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout most of Washington.Habitat: Open places, often in sandy soil.Origin: NativeFlowers: July-September

Steller's wormwood (Artemisiastelleriana)Distribution: Known from a few locations along the north coast in Washington; known only from Washington in western North America; central Canada and U.S. to the Atlantic Coast.Habitat: Coastal dunes and beaches.Origin: IntroducedFlowers: May-September

Three-forked wormwood (Artemisiafurcata)Distribution: Occurring in the Cascades and Olympic Mountains of Washington; Alaska south to Washington, east to Northwest Territories, Alberta, and Nunavut.Habitat: Open, rocky ledges and talus slopes at high elevations in the mountains.Origin: NativeFlowers: July-September

Wormwood (Artemisiaabsinthium)Distribution: Introduced in the northern half of the United States and southern CanadaHabitat: Weed of roadsides and waste placesOrigin: IntroducedFlowers: July - September

Square-stalked St. John's Wort (Hypericumtetrapterum)Distribution: Introduced occasionally in western Washington.Habitat: Damp wasteland.Origin: IntroducedFlowers: July - September

Swallow wort (Chelidoniummajus)Distribution: Weedy introduction across southern Canada and the northern tier of states in the United States.Habitat: Moist to dry woods, roadsides, fields, waste areas.Origin: Introduced from EurasiaFlowers: May - July

Narrowleaf wyethia (Wyethiaangustifolia)Distribution: Occurring in southwestern Washington and in the Columbia River Gorge in Washington; Washington south to California.Habitat: Meadows and moist, open hillsides at low elevations.Origin: NativeFlowers: May-July